code: def test_special_cases_2(self):
      sentence = "="
      actual = word_tokenize(sentence)
      expected = ["="]
      self.assertEqual(actual, expected)
  
file_path: underthesea/tests/pipeline/word_tokenize/test_word_tokenize.py
imports: from unittest import TestCase
  from underthesea import word_tokenize
  import signal
label_desc: Use image node_id 2 for calling the TestWordTokenize obj's underlying member method code with example usage: obj.test_special_cases_2() without return types